Development and Validation of Rapid 3D Radiation Field Evaluation Technique for Nuclear Power Plants

Rapid 3D radiation field evaluation is the key point of occupational dose optimization for design and operation of nuclear power plant. Based on the requirement analysis from designers and operators of nuclear power plant, three key technical issues are identified and solved through the development of the RPOS system, which are rapid calculation of 3D radiation field, reconstruction of the calculated 3D radiation field based on measured data, and occupational dose optimization based on 3D radiation field. Operational measurements of dose rate from in-service nuclear power plants are used to test the RPOS system, which shows that accurate 3D radiation field can be rapidly generated by the RPOS system and effectively used on the occupational dose optimization for on-site workers. The applications of the established rapid 3D radiation field evaluation technique on HPR1000 unit design provide evidence on its feasibility in a large scale, the improvement of radiation protection design efficiency and the enhancement of ALARA assessment and justification for nuclear power plants

Efficient model for the elastic load of film-substrate system involving imperfect interface effects

In this paper, an efficient calculation method based on discrete Fourier transformation is developed for evaluating elastic load induced elastic deformation fields of film-substrate system. Making use of 2D discrete Fourier transformation, the elastic fields induced by Hertz load is harvested in frequency domain, and the displacement and stress fields across the interface are enforced to satisfy the elasticity conditions for each Fourier modes. Given arbitrary distributed stress field at free surface plane of the three types of film-substrate systems, unique resultant elastic field within the can be harvested. Hertz load of half space, elastic film on elastic substrate, elastic film on rigid substrate system and elastic film-substrate system with three types of imperfect interface models are investigated: (1) the spring-like imperfect interface model which can be described as: U-k(f)vertical bar(zf=-h) - u(k)(s)vertical bar(zs=0) = K-T sigma(kz) and u(z)(f)vertical bar(zf=-h) - u(z)(s)vertical bar(zs=0) = K-N sigma(zz); (2) the dislocation-like interface model, where interface displacement and stress components relation can be described as: u(i)(f)vertical bar(zf=0) = k(ij)(u) u(i)(s)vertical bar(zs=0) and sigma(f)(iz)vertical bar(zf=0) = sigma(s)(iz)vertical bar(zs=0); (3) the force-like interface model, where interface displacement and stress components relation can be described as: u(i)(f)vertical bar(zf=0) = u(i)(s)vertical bar(zs=0) and sigma(f)(iz)vertical bar(zf=0) = k(ij)(t) sigma(s)(iz)vertical bar(zs=0) respectively. Finally, several simulation examples are performed for verification of the reliability and efficiency of the proposed semi-analytical methods. (C) 2020 The Authors. Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics.